Morphological differences in epithelial papillae and microvascular architecture according to site in cat filiform papillae

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There have been no reports comparing the morphologies of epithelial papillae (EP) and the microvascular architecture of the cat filiform papillae (FP). We observed and compared the morphologies of EP and the microvascular architecture of FP at various locations under a scanning electron microscope. We found that EP were composed of a base and processes, which were divided into a main process and accessory processes. The accessory processes existed only in the anterior half of the tongue. Based on the shapes of the main process and arrangements of the accessory processes, we classified FP into the following five types : circular conical, complex conical, complex columnar, simple columnar, and simple conical. The microvascular architecture was composed of a capillary plexus and multiple capillary loops (CLs). The capillary plexus was classified as either conical or columnar. The CLs were arranged in an ellipse for the conical type, and in a semicircle for the columnar type. Based on the comparison of EP and microvascular architecture, the morphology of the main process matched that of the capillary plexus throughout. In contrast, no correspondence whatsoever was observed between the number of accessory processes and CLs.

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